Historical detoursSourced
Before electronic mail,
mail moved through air tubes.
Pneumatic systems send carriers through pipes using air pressure. They transported papers and money, and still have uses such as moving hospital samples.
The message travelled
inside a physical capsule.
Summary / translation: Unbubly · CC BY-SA 4.0
Source and reuse details
Pneumatic tube · Wikimedia contributors
Adapted, summarized and translated from the source. Adapted text is also available under CC BY-SA 4.0.
Reviewed: 2026-09-30